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EP2867382B2 - Outer coating for an underground piping member made from iron, coated piping member and method for depositing the coating - Google Patents

Outer coating for an underground piping member made from iron, coated piping member and method for depositing the coating Download PDF

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Publication number
EP2867382B2
EP2867382B2 EP13734028.7A EP13734028A EP2867382B2 EP 2867382 B2 EP2867382 B2 EP 2867382B2 EP 13734028 A EP13734028 A EP 13734028A EP 2867382 B2 EP2867382 B2 EP 2867382B2
Authority
EP
European Patent Office
Prior art keywords
layer
outer coating
alloy
depositing
iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13734028.7A
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German (de)
French (fr)
Other versions
EP2867382A1 (en
EP2867382B1 (en
Inventor
Olivier BONDIL
Gérard Nouail
Jean-Marc Pedeutour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain PAM Canalisation SAS
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Saint Gobain PAM Canalisation SAS
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Publication date
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Application filed by Saint Gobain PAM Canalisation SAS filed Critical Saint Gobain PAM Canalisation SAS
Priority to PL13734028.7T priority Critical patent/PL2867382T5/en
Publication of EP2867382A1 publication Critical patent/EP2867382A1/en
Application granted granted Critical
Publication of EP2867382B1 publication Critical patent/EP2867382B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
    • C23C4/16—Wires; Tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used

Definitions

  • the present invention relates to an outer coating of the type for a buried pipe element and based on iron, in particular cast iron, the outer coating comprising a first porous layer and a second porous layer placed on the first layer and able to plug pores of the first layer.
  • the invention also relates to a pipe element coated with this outer coating, as well as a process for depositing the coating on the pipe element.
  • piping elements is meant the pipes, as well as the various accessories such as elbows, fittings, etc., used for example in the field of water supply.
  • Soil corrosion of ferrous metals is a phenomenon of a different nature from atmospheric corrosion and consists essentially of the creation of oxidation zones electrically associated with reduction zones which may be located at a certain distance . As a result, localized and therefore significant deterioration of the ferrous metal occurs.
  • the anti-corrosion protection of buried piping elements thus presents a particular difficulty, especially since the grounds are heterogeneous and of very diverse natures, since the piping elements, depending on their use, convey fluids at different temperatures, modifying the conditions corrosion, and that the handling of the pipe elements intended to be buried frequently leads to injury in various locations on their outer surface.
  • the document EP-A-0 686 246 describes a ductile cast iron pipe element comprising a coating comprising a first porous metallized layer and a second layer of paint providing a “pore-sealing” effect.
  • This coating provides effective and long-lasting protection of the piping against corrosion, once it is buried. However, the health and environmental aspects of this coating no longer correspond to the current stricter requirements.
  • An object of the invention is to provide a coating ensuring even more effective anti-corrosion protection of the pipe element, in particular in corrosive soil, with a competitive cost and improved health and environmental properties.
  • the subject of the invention is an outer covering according to claim 1.
  • the invention also relates to a coated pipe element, based on iron, in particular cast iron, intended to be buried, comprising an outer coating as described above.
  • the invention finally relates to a deposition method according to claim 8.
  • a coated piping element 1 buried in a ground 3 and used to transport a fluid 5, for example drinking water.
  • the coated pipe element 1 comprises a pipe element 7 and an outer coating 9 located between the ground 3 and the pipe element 7, advantageously distributed over the pipe element 7 so as to isolate it from the ground 3.
  • the pipe element 7 is made of iron, advantageously of ductile iron.
  • the pipe element 7 is for example a pipe. In the example shown, it extends in a longitudinal direction L perpendicular to the plane of the figure. Only a portion of the section of the pipe element 7 is shown in the figure, the rest of the section being able to be extrapolated without difficulty from the portion shown.
  • the fluid 5 circulates inside the pipe element 7 in the longitudinal direction L.
  • An internal coating may exist on an internal wall of the pipe element 7, to isolate the fluid 5 from the piping element 7.
  • the outer coating 9 comprises a first layer 11 and a second layer 13 placed on the first layer 11.
  • the first layer 11 is porous and advantageously deposited by electric arc metallization.
  • the first layer 11 comprises a zinc alloy or pseudo-alloy.
  • the alloy or pseudo-alloy comprises, in mass proportion, at least 50% zinc, and between 0.5% and 40% aluminum.
  • the first layer 11 comprises 85% zinc and 15% aluminum in mass proportions.
  • the first layer 11 Under the action of the corrosive agents of the ground, the first layer 11 is transformed into a protective layer of stable corrosion products in the medium where it originated.
  • the layer of zinc/aluminum alloy is moreover called “anodic" with respect to cast iron, in the sense that it can gradually be transformed by oxidation under the effect of the electrochemical cell formed by the cast iron, the alloy and the ground, to protect the cast iron underlying or exposed at the level of defects of the alloy layer, by forming said protective layer.
  • the first layer 11 Due to its deposition by arc metallization, the first layer 11 consists of solidified droplets and is therefore porous.
  • the settings of the metallization process governing the size of the pores and the thickness of the layer those skilled in the art are able to adjust the conditions, in particular the speed, of formation of the protective layer. It has been found that the biphasic structure of the zinc/aluminum alloy promotes the trapping of zinc transformation products.
  • the first layer 11 also comprises magnesium, and/or copper, and/or silver, with mass contents of between 0.5% and 3%. These elements are for example added in elementary form, or as oxides.
  • the first layer 11 has a surface density of at least 200 g/m ⁇ 2>, preferably at least 350 g/m ⁇ 2>, for example about 400 g/m ⁇ 2>.
  • the first layer 11 is deposited by thermal spraying, to obtain the aforementioned surface densities.
  • the second layer 13 is a paint in aqueous phase (before drying), also called “waterborne”.
  • the second layer 13 is porous and makes it possible to ensure the proper functioning of the galvanic protection provided by the first layer 11, on the one hand by its ability to plug the pores of the first layer 11 and on the other hand by its porosity which makes it possible to regulate the speed of the electrochemical reactions in the vicinity of the first layer 11.
  • the paint is monocomponent in aqueous phase.
  • the paint comprises at least one synthetic resin emulsified and formulated from polymers or copolymers such as, for example, acrylic, styrene acrylic, vinyl chloride, acrylate vinyl chloride, vinylidene chloride, vinyls, methacrylic, polyvinyl acetate.
  • the second layer 13 and the paint are advantageously devoid of organic solvent or co-solvent, in particular derived from hydrocarbons, and devoid of bisphenol.
  • the paint is for example formulated from compounds belonging to the positive lists of the European Union for contact with foodstuffs (European regulation EU n° 10/2011) and having, on the date of filing of this patent application , regulatory approvals (for example a French Sanitary Conformity Certificate (ACS), or an English WRAS certificate) for products placed in contact with water intended for human consumption.
  • European Union for contact with foodstuffs
  • regulatory approvals for example a French Sanitary Conformity Certificate (ACS), or an English WRAS certificate
  • the second layer 13 advantageously comprises one or more active ingredients capable of coming into contact with water intended for human consumption, for example bactericidal and/or passivating agents (for example silver, copper, copper oxides, zinc phosphate, oxide zinc).
  • the bactericidal agent is, for example, a copper salt capable of restricting the activity of soil bacteria 3.
  • the bactericidal active principles are advantageously with very slow migration (water, soil) once the emulsion has coalesced.
  • the solid particles of the bactericidal agents are then encapsulated by the resin: the diffusion of water from the external environment through the resin leads to the ionization of these agents which subsequently, by slow diffusion, will be released into the external environment.
  • the method comprises a step a) of depositing on the pipe element 7 the first layer 11 as described above, and a step b) of deposition on the first layer 11 of a second layer 13 as described above.
  • the first layer 11 is advantageously deposited by thermal spraying, preferably by electric arc.
  • a sufficient quantity of material is deposited to obtain a surface density of the first layer 11 of at least 200 g/m ⁇ 2>, preferably of at least 350 g/m ⁇ 2>.
  • the projection is done for example from solid wires or cored wires depending on the availability of the zinc alloy.
  • step b) the second layer 13 is advantageously deposited on the first layer 11 while the latter is not covered with white efflorescences, that is to say with a reduced time difference between the deposition of the second layer 13 and the first layer 11.
  • the second layer 13 is advantageously deposited by gun without compressed air, in particular for large surfaces, and/or by brush, in particular for small surfaces or retouching, so that the second layer 13 has a thickness advantageously between 60 ⁇ m and 150 ⁇ m dry, for example a thickness of about 120 ⁇ m dry.
  • the second layer 13 advantageously has a dry surface density of between 120 g/m ⁇ 2> and 350 g/m ⁇ 2>, for example a dry surface density of 250 g/m ⁇ 2>.
  • the deposition of the second layer 13 is advantageously at least partly carried out by spray gun without compressed air, the application carried out with the spray gun taking place on a surface having a temperature comprised between 35° C. and 60° C. This surface is brought to said temperature, for example by immersing at least part of the pipe element 7 coated with the first layer 11 in a tank of water at this temperature.
  • the water advantageously contains a surface conversion agent, for example zinc phosphate, zinc oxide, to cover the first layer 11 with a superficially transformed alloy film.
  • a surface conversion agent for example zinc phosphate, zinc oxide
  • the surface conversion agent suitable for alloyed zinc advantageously has regulatory approvals for contact with water intended for human consumption.
  • the wetting of the first layer 11 by water containing the active ingredient results in covering the surface of the first layer 11 with an alloy film superficially transformed into, for example, zinc hydroxide and oxide, or zinc phosphate , capable of delaying the subsequent oxidation of the first layer 11 once the pipe element 1 has been subjected to its service environment, and favorable to an increase in the duration of the protection.
  • an alloy film superficially transformed into, for example, zinc hydroxide and oxide, or zinc phosphate capable of delaying the subsequent oxidation of the first layer 11 once the pipe element 1 has been subjected to its service environment, and favorable to an increase in the duration of the protection.
  • External coating 9 on pipe 7 of ductile cast iron composed of a first metallized layer 11 deposited by electric arc, of 400 g/m ⁇ 2> of zinc-aluminum alloy with 15% aluminum, and of a second layer 13 consisting of a single-component paint in aqueous phase, the second layer 13 having a thickness of 120 ⁇ m dry and a surface density dry of 250 g/m ⁇ 2>.
  • the paint is an emulsion based on acrylic-PVDC copolymer and was applied after immersing the pipe 7 coated with the first layer 11 in a tub of water at 60°C containing a zinc polyphosphate to create a surface film of a few microns. on the surface of the first layer 11.
  • the copolymer emulsion based on acrylic-PVDC copolymer comprises an active ingredient, for example a copper salt, with a view to restricting the activity of soil bacteria 3 at the level of the outer coating 9.
  • the outer coating 9 provides even more effective anti-corrosion protection of the pipe element 7, in particular in corrosive soil 3, with sanitary and improved environments. Indeed, the second layer 13 very effectively blocks the pores of the first layer 11. The association of the second layer 13 on the first layer 11 promotes the initiation of a conversion of the surface of metal droplets constituting the first layer 11 In addition, the outer coating 9, by virtue of its constitution and its method of application, is very competitively priced.
  • the optional characteristic according to which the second layer 13 is devoid of organic solvent or co-solvent, in particular solvent or co-solvent derived from hydrocarbons has the advantage that the outer coating 9 is compatible with regulatory requirements. related to contact with water intended for human consumption.
  • VOCs volatile organic solvents
  • the safety conditions for operators who manufacture or install the pipe element 1 are improved.
  • the treatment and elimination of the waste associated with the pipe element 1 can be carried out by conventional paint recycling installations.
  • the long-term resistance of the coating 9 is improved in all soils.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Description

La présente invention concerne un revêtement extérieur du type pour élément de tuyauterie enterré et à base de fer, notamment en fonte, le revêtement extérieur comprenant une première couche poreuse et une seconde couche poreuse disposée sur la première couche et apte à boucher des pores de la première couche.The present invention relates to an outer coating of the type for a buried pipe element and based on iron, in particular cast iron, the outer coating comprising a first porous layer and a second porous layer placed on the first layer and able to plug pores of the first layer.

L'invention concerne également un élément de tuyauterie revêtu de ce revêtement extérieur, ainsi qu'un procédé de dépôt du revêtement sur l'élément de tuyauterie.The invention also relates to a pipe element coated with this outer coating, as well as a process for depositing the coating on the pipe element.

Par "éléments de tuyauterie", on entend les tuyaux, ainsi que les divers accessoires tels que les coudes, les raccords, etc., utilisés par exemple dans le domaine de l'adduction d'eau.By "piping elements" is meant the pipes, as well as the various accessories such as elbows, fittings, etc., used for example in the field of water supply.

Par le document JP-A-23010357 , on connaît un procédé de fabrication de revêtement de tube d'acier. Ce document envisage un dépôt par pulvérisation d'un alliage zinc/ aluminium sacrificiel, suivi du dépôt d'une résine époxy. Il semble que la couche de résine doive être étanche. Ce procédé s'applique aux revêtements de tubes d'un "espace de séchage", et donc certainement de tubes aériens, constitués de fer ou d'acier.By document JP-A-23010357 , there is known a method of manufacturing a steel tube coating. This document envisages a spray deposition of a sacrificial zinc/aluminum alloy, followed by the deposition of an epoxy resin. It looks like the resin layer should be waterproof. This process applies to the coatings of tubes of a "drying space", and therefore certainly of aerial tubes, made of iron or steel.

La corrosion par les sols des métaux ferreux est un phénomène d'une nature différente de la corrosion atmosphérique et consiste, pour l'essentiel, en la création de zones d'oxydation électriquement associées à des zones de réduction pouvant être situées à une certaine distance. En conséquence, il se produit des détériorations localisées et par conséquent importantes du métal ferreux.Soil corrosion of ferrous metals is a phenomenon of a different nature from atmospheric corrosion and consists essentially of the creation of oxidation zones electrically associated with reduction zones which may be located at a certain distance . As a result, localized and therefore significant deterioration of the ferrous metal occurs.

La protection anticorrosion des éléments de tuyauterie enterrés présente ainsi une difficulté particulière, d'autant plus que les terrains sont hétérogènes et de natures très diverses, que les éléments de tuyauterie, suivant leur utilisation, véhiculent des fluides à des températures différentes, modifiant les conditions de corrosion, et que la manutention des éléments de tuyauteries destinées à être enterrées conduit fréquemment à blesser en divers emplacements leur surface extérieure.The anti-corrosion protection of buried piping elements thus presents a particular difficulty, especially since the grounds are heterogeneous and of very diverse natures, since the piping elements, depending on their use, convey fluids at different temperatures, modifying the conditions corrosion, and that the handling of the pipe elements intended to be buried frequently leads to injury in various locations on their outer surface.

Le document EP-A-0 686 246 décrit un élément de tuyauterie en fonte ductile comportant un revêtement comprenant une première couche métallisée poreuse et une seconde couche de peinture assurant un effet « bouche-pores ». Ce revêtement assure une protection efficace et durable de la tuyauterie contre la corrosion, une fois celle-ci enterrée. Toutefois, les aspects sanitaires et environnementaux de ce revêtement ne correspondent plus aux exigences renforcées actuelles.The document EP-A-0 686 246 describes a ductile cast iron pipe element comprising a coating comprising a first porous metallized layer and a second layer of paint providing a “pore-sealing” effect. This coating provides effective and long-lasting protection of the piping against corrosion, once it is buried. However, the health and environmental aspects of this coating no longer correspond to the current stricter requirements.

Un but de l'invention est de fournir un revêtement assurant une protection anticorrosion encore plus efficace de l'élément de tuyauterie, en particulier en sol corrosif, avec un coût compétitif et des propriétés sanitaires et environnementales améliorées.An object of the invention is to provide a coating ensuring even more effective anti-corrosion protection of the pipe element, in particular in corrosive soil, with a competitive cost and improved health and environmental properties.

A cet effet, l'invention a pour objet un revêtement extérieur selon la revendication 1.To this end, the subject of the invention is an outer covering according to claim 1.

Selon des modes particuliers de réalisation, le revêtement extérieur peut comprendre l'une ou plusieurs des caractéristiques suivantes, prise(s) isolément ou selon toutes les combinaisons techniquement possibles :

  • ladite au moins résine de synthèse est formulée à partir d'au moins un polymère ou au moins un copolymère pris dans la liste consistant en les polymères ou copolymères acrylique, styrène acrylique, halogénures de vinyle tels que chlorure de vinyle, chlorure de vinyle acrylate, halogénures de vinylidène tels que chlorure de vinylidène, vinyliques, méthacrylique, acétate polyvinylique, et leurs mélanges ;
  • la première couche présente une densité surfacique d'au moins 200 g/m<2>, de préférence au moins 350 g/m<2> ;
  • la seconde couche est dépourvue de solvant ou de co-solvant organiques, notamment de solvant ou de co-solvant dérivés des hydrocarbures, et dépourvue de bisphénol ;
  • la seconde couche comprend un ou plusieurs principes actifs aptes à entrer en contact avec des eaux destinées à la consommation humaine et à avoir une action bactéricide et/ou passivante ;
  • la seconde couche présente une densité surfacique à sec comprise entre 120 g/m<2> et 350 g/m<2> ;
  • la première couche est déposée par projection thermique, de préférence par arc électrique ;
  • la peinture contient, en masse, entre 20% et 60 %, de préférence entre 30% et 50 %, d'eau, entre 20% et 70 %, de préférence entre 25% et 45%, d'au moins une résine de synthèse, et entre 1% et 30% d'au moins un pigment/colorant organique ou minéral ;
  • ledit au moins un pigment/colorant organique ou minéral est pris dans la liste consistant en un oxyde métallique tel que l'oxyde de fer, l'oxyde de titane, l'oxyde de chrome, ou en le noir de carbone, la phtalocyanine de cuivre, et leurs mélanges ;
  • la peinture contient, en masse, entre 1% et 10 % d'au moins un pigment anticorrosion ;
  • ledit au moins un pigment anticorrosion est pris parmi dans la liste consistant en le phosphate de zinc, l'oxyde de zinc, l'oxyde de zinc modifié, et leurs mélanges ;
  • la peinture contient, en masse, entre 10% et 40 % d'au moins une charge prise dans la liste consistant en le sulfate de baryte, le carbonate de calcium, le talc, le mica, les silicates, la silice, le kaolin, la dolomie, et leurs mélanges ; et
  • la peinture contient, en masse, entre 0,1% et 5 % d'au moins un additif pour peinture pris dans la liste consistant en les agents épaississant, passivants, biocides, bactéricides, mouillants, dispersants, anticorrosion, anti-mousse, émulsifiants, de tension, et leurs mélanges.
According to particular embodiments, the outer covering may comprise one or more of the following characteristics, taken separately or in all technically possible combinations:
  • said at least one synthetic resin is formulated from at least one polymer or at least one copolymer taken from the list consisting of acrylic polymers or copolymers, acrylic styrene, vinyl halides such as vinyl chloride, vinyl acrylate chloride, vinylidene halides such as vinylidene chloride, vinyl, methacrylic, polyvinyl acetate, and mixtures thereof;
  • the first layer has a surface density of at least 200 g/m<2>, preferably at least 350 g/m<2>;
  • the second layer is devoid of organic solvent or co-solvent, in particular solvent or co-solvent derived from hydrocarbons, and devoid of bisphenol;
  • the second layer comprises one or more active ingredients capable of coming into contact with water intended for human consumption and of having a bactericidal and/or passivating action;
  • the second layer has a dry surface density of between 120 g/m<2> and 350 g/m<2>;
  • the first layer is deposited by thermal spraying, preferably by electric arc;
  • the paint contains, by mass, between 20% and 60%, preferably between 30% and 50%, of water, between 20% and 70%, preferably between 25% and 45%, of at least one resin of synthesis, and between 1% and 30% of at least one organic or mineral pigment/dye;
  • said at least one organic or inorganic pigment/dye is taken from the list consisting of a metal oxide such as iron oxide, titanium oxide, chromium oxide, or carbon black, phthalocyanine copper, and mixtures thereof;
  • the paint contains, by mass, between 1% and 10% of at least one anti-corrosion pigment;
  • said at least one anti-corrosion pigment is selected from the list consisting of zinc phosphate, zinc oxide, modified zinc oxide, and mixtures thereof;
  • the paint contains, by mass, between 10% and 40% of at least one filler taken from the list consisting of baryta sulphate, calcium carbonate, talc, mica, silicates, silica, kaolin, dolomite, and their mixtures; and
  • the paint contains, by mass, between 0.1% and 5% of at least one paint additive taken from the list consisting of thickening, passivating, biocidal, bactericidal, wetting, dispersing, anti-corrosion, anti-foaming, emulsifying agents , voltage, and mixtures thereof.

L'invention concerne aussi un élément de tuyauterie revêtu, à base de fer, notamment en fonte, destiné à être enterré, comprenant un revêtement extérieur tel que décrit ci-dessus.The invention also relates to a coated pipe element, based on iron, in particular cast iron, intended to be buried, comprising an outer coating as described above.

L'invention concerne enfin un procédé de dépôt selon la revendication 8.The invention finally relates to a deposition method according to claim 8.

Selon des modes particuliers de réalisation, le procédé peut comprendre l'une ou plusieurs des caractéristiques suivantes, prise(s) isolément ou selon toutes les combinaisons techniquement possibles :

  • à l'étape b) ladite au moins une résine de synthèse est formulée à partir d'au moins un polymère ou au moins un copolymère pris dans la liste consistant en les polymères ou copolymères acrylique, styrène acrylique, halogénures de vinyle tels que chlorure de vinyle, chlorure de vinyle acrylate, halogénures de vinylidène tels que chlorure de vinylidène, vinyliques, méthacrylique, acétate polyvinylique, et leurs mélanges ;
  • l'étape b) de dépôt de la seconde couche est réalisée par pistolet, et/ou à la brosse ou au rouleau, de manière à ce que la seconde couche ait une épaisseur comprise entre 60 µm et 150 µm à sec ;
  • l'étape b) de dépôt de la seconde couche est réalisée de manière à ce que la seconde couche ait une densité surfacique à sec comprise entre 120 g/m<2> et 350 g/m<2> ;
  • l'étape b) de dépôt de la seconde couche est au moins en partie réalisée par pistolet sans air comprimé, l'application réalisée au pistolet se faisant sur une surface ayant une température comprise entre 35°C et 60°C ; à l'étape b), ladite surface est portée à la température comprise entre 35°C et 60°C par immersion d'au moins une partie de l'élément de tuyauterie dans de l'eau contenant de préférence un agent de conversion de surface pour recouvrir la première couche d'un film d'alliage superficiellement transformé, l'agent de conversion étant adapté pour le contact avec des eaux destinées à la consommation humaine ;
  • ladite au moins une résine de synthèse est formulée à partir d'au moins un polymère ou au moins un copolymère pris dans la liste consistant en les polymères ou copolymères acrylique, styrène acrylique, halogénures de vinyle tels que chlorure de vinyle, chlorure de vinyle acrylate, halogénures de vinylidène tels que chlorure de vinylidène, vinyliques, méthacrylique, acétate polyvinylique, et leurs mélanges ;
  • à l'étape a), la première couche est déposée par projection thermique, de préférence par arc électrique ;
  • à l'étape b), la seconde couche est dépourvue de solvant organique, notamment de solvant dérivé des hydrocarbures, et dépourvue de bisphénol ; et
  • à l'étape b), la seconde couche comprend un ou plusieurs principes actifs aptes à entrer en contact avec des eaux destinées à la consommation humaine et à avoir une action bactéricide et/ou passivante ;
  • l'étape b) de dépôt de la seconde couche est réalisée par pistolet avec air comprimé ;
  • l'étape b) de dépôt de la seconde couche est réalisée par pistolet sans air comprimé.
According to particular embodiments, the method may comprise one or more of the following characteristics, taken in isolation or in all technically possible combinations:
  • in step b) said at least one synthetic resin is formulated from at least one polymer or at least one copolymer taken from the list consisting of acrylic polymers or copolymers, acrylic styrene, vinyl halides such as vinyl, vinyl chloride acrylate, vinylidene halides such as vinylidene chloride, vinyl, methacrylic, polyvinyl acetate, and mixtures thereof;
  • step b) of depositing the second layer is carried out by spray gun, and/or by brush or roller, so that the second layer has a thickness of between 60 μm and 150 μm dry;
  • step b) of depositing the second layer is carried out so that the second layer has a dry surface density of between 120 g/m<2> and 350 g/m<2>;
  • step b) of depositing the second layer is at least partly carried out by spray gun without compressed air, the application carried out with the spray gun taking place on a surface having a temperature of between 35° C. and 60° C.; in step b), said surface is brought to a temperature of between 35°C and 60°C by immersing at least part of the pipe element in water preferably containing a surface to cover the first layer of a superficially transformed alloy film, the conversion agent being suitable for contact with water intended for human consumption;
  • said at least one synthetic resin is formulated from at least one polymer or at least one copolymer taken from the list consisting of polymers or copolymers acrylic, styrene acrylic, vinyl halides such as vinyl chloride, vinyl chloride acrylate , vinylidene halides such as vinylidene chloride, vinyl, methacrylic, polyvinyl acetate, and mixtures thereof;
  • in step a), the first layer is deposited by thermal spraying, preferably by electric arc;
  • in step b), the second layer is devoid of organic solvent, in particular of solvent derived from hydrocarbons, and devoid of bisphenol; and
  • in step b), the second layer comprises one or more active principles capable of coming into contact with water intended for human consumption and having a bactericidal and/or passivating action;
  • step b) of depositing the second layer is carried out by gun with compressed air;
  • step b) of depositing the second layer is carried out by gun without compressed air.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, et faite en se référant à la figure unique, qui est une vue schématique et partielle d'une section transversale d'un élément de tuyauterie selon l'invention.The invention will be better understood on reading the following description, given solely by way of example, and made with reference to the single figure, which is a schematic and partial view of a cross section of an element piping according to the invention.

Sur la figure est représenté un élément de tuyauterie revêtu 1 enterré dans un sol 3 et servant à transporter un fluide 5, par exemple de l'eau potable.In the figure is shown a coated piping element 1 buried in a ground 3 and used to transport a fluid 5, for example drinking water.

L'élément de tuyauterie revêtu 1 comprend un élément de tuyauterie 7 et un revêtement extérieur 9 situé entre le sol 3 et l'élément de tuyauterie 7, avantageusement réparti sur l'élément de tuyauterie 7 de manière à l'isoler du sol 3.The coated pipe element 1 comprises a pipe element 7 and an outer coating 9 located between the ground 3 and the pipe element 7, advantageously distributed over the pipe element 7 so as to isolate it from the ground 3.

L'élément de tuyauterie 7 est à base de fer, avantageusement en fonte ductile. L'élément de tuyauterie 7 est par exemple un tuyau. Dans l'exemple représenté, il s'étend selon une direction longitudinale L perpendiculaire au plan de la figure. Seule une portion de la section de l'élément de tuyauterie 7 est représentée sur la figure, le reste de la section pouvant s'extrapoler sans difficulté à partir de la portion représentée.The pipe element 7 is made of iron, advantageously of ductile iron. The pipe element 7 is for example a pipe. In the example shown, it extends in a longitudinal direction L perpendicular to the plane of the figure. Only a portion of the section of the pipe element 7 is shown in the figure, the rest of the section being able to be extrapolated without difficulty from the portion shown.

Le fluide 5 circule à l'intérieur de l'élément de tuyauterie 7 selon la direction longitudinale L. Un revêtement intérieur, non représenté, peut exister sur une paroi interne de l'élément de tuyauterie 7, pour isoler le fluide 5 de l'élément de tuyauterie 7.The fluid 5 circulates inside the pipe element 7 in the longitudinal direction L. An internal coating, not shown, may exist on an internal wall of the pipe element 7, to isolate the fluid 5 from the piping element 7.

Le revêtement extérieur 9 comprend une première couche 11 et une seconde couche 13 disposée sur la première couche 11.The outer coating 9 comprises a first layer 11 and a second layer 13 placed on the first layer 11.

La première couche 11 est poreuse et avantageusement déposée par métallisation à l'arc électrique. La première couche 11 comprend un alliage ou pseudo-alliage de zinc. L'alliage ou pseudo-alliage comprend, en proportion massique, au moins 50% de zinc, et entre 0,5% et 40% d'aluminium. Par exemple, la première couche 11 comprend 85% de zinc et 15% d'aluminium en proportions massiques.The first layer 11 is porous and advantageously deposited by electric arc metallization. The first layer 11 comprises a zinc alloy or pseudo-alloy. The alloy or pseudo-alloy comprises, in mass proportion, at least 50% zinc, and between 0.5% and 40% aluminum. For example, the first layer 11 comprises 85% zinc and 15% aluminum in mass proportions.

Sous l'action des agents corrosifs du sol, la première couche 11 se transforme en une couche protectrice de produits de corrosion stable dans le milieu où elle a pris naissance. La couche d'alliage zinc/aluminium est par ailleurs dite "anodique" par rapport à la fonte, en ce sens qu'elle peut se transformer progressivement par oxydation sous l'effet de la pile électrochimique formée par la fonte, l'alliage et le sol, pour protéger la fonte sous-jacente ou mise à nu au niveau de défauts de la couche d'alliage, par formation de ladite couche protectrice.Under the action of the corrosive agents of the ground, the first layer 11 is transformed into a protective layer of stable corrosion products in the medium where it originated. The layer of zinc/aluminum alloy is moreover called "anodic" with respect to cast iron, in the sense that it can gradually be transformed by oxidation under the effect of the electrochemical cell formed by the cast iron, the alloy and the ground, to protect the cast iron underlying or exposed at the level of defects of the alloy layer, by forming said protective layer.

Du fait de son dépôt par métallisation à l'arc, la première couche 11 est constituée de gouttelettes solidifiées et est donc poreuse. Par une adaptation des réglages du procédé de métallisation gouvernant la taille des pores et de l'épaisseur de la couche, l'homme du métier est capable de régler les conditions, notamment la vitesse, de formation de la couche protectrice. Il a été constaté que la structure biphasique de l'alliage zinc/aluminium favorise le piégeage des produits de transformation du zinc.Due to its deposition by arc metallization, the first layer 11 consists of solidified droplets and is therefore porous. By adapting the settings of the metallization process governing the size of the pores and the thickness of the layer, those skilled in the art are able to adjust the conditions, in particular the speed, of formation of the protective layer. It has been found that the biphasic structure of the zinc/aluminum alloy promotes the trapping of zinc transformation products.

La première couche 11 comprend également du magnésium, et/ou du cuivre, et/ou de l'argent, avec des teneurs massiques comprises entre 0,5% et 3%. Ces éléments sont par exemple ajoutés sous forme élémentaire, ou d'oxydes.The first layer 11 also comprises magnesium, and/or copper, and/or silver, with mass contents of between 0.5% and 3%. These elements are for example added in elementary form, or as oxides.

La première couche 11 présente une densité surfacique d'au moins 200 g/m<2>, de préférence au moins 350 g/m<2>, par exemple environ 400 g/m<2>. Avantageusement, la première couche 11 est déposée par projection thermique, pour obtenir les densités surfaciques précitées.The first layer 11 has a surface density of at least 200 g/m<2>, preferably at least 350 g/m<2>, for example about 400 g/m<2>. Advantageously, the first layer 11 is deposited by thermal spraying, to obtain the aforementioned surface densities.

La seconde couche 13 est une peinture en phase aqueuse (avant séchage), également dite « hydrodiluable ». La seconde couche 13 est poreuse et permet d'assurer le bon fonctionnement de la protection galvanique apportée par la première couche 11, d'une part par son aptitude à boucher des pores de la première couche 11 et d'autre part par sa porosité qui permet de réguler la vitesse des réactions électrochimiques au voisinage de la première couche 11.The second layer 13 is a paint in aqueous phase (before drying), also called "waterborne". The second layer 13 is porous and makes it possible to ensure the proper functioning of the galvanic protection provided by the first layer 11, on the one hand by its ability to plug the pores of the first layer 11 and on the other hand by its porosity which makes it possible to regulate the speed of the electrochemical reactions in the vicinity of the first layer 11.

La peinture est monocomposante en phase aqueuse. La peinture comporte au moins une résine de synthèse émulsionnée et formulée à partir de polymères ou copolymères tels que, par exemple, acrylique, styrène acrylique, chlorure de vinyle, chlorure de vinyle acrylate, chlorure de vinylidène, vinyliques, méthacrylique, acétate polyvinylique.The paint is monocomponent in aqueous phase. The paint comprises at least one synthetic resin emulsified and formulated from polymers or copolymers such as, for example, acrylic, styrene acrylic, vinyl chloride, acrylate vinyl chloride, vinylidene chloride, vinyls, methacrylic, polyvinyl acetate.

La seconde couche 13 et la peinture sont avantageusement dépourvues de solvant ou co-solvant organique, notamment dérivé des hydrocarbures, et dépourvues de bisphénol.The second layer 13 and the paint are advantageously devoid of organic solvent or co-solvent, in particular derived from hydrocarbons, and devoid of bisphenol.

La peinture est par exemple formulée à partir de composés appartenant aux listes positives de l'Union Européenne pour le contact avec les denrées alimentaires (règlement européen UE n° 10 / 2011) et disposant, à la date de dépôt de la présente demande de brevet, des agréments réglementaires (par exemple une Attestation de Conformité Sanitaire française (ACS), ou un certificat WRAS anglais) pour les produits placés au contact des eaux destinées à la consommation humaine.The paint is for example formulated from compounds belonging to the positive lists of the European Union for contact with foodstuffs (European regulation EU n° 10/2011) and having, on the date of filing of this patent application , regulatory approvals (for example a French Sanitary Conformity Certificate (ACS), or an English WRAS certificate) for products placed in contact with water intended for human consumption.

La seconde couche 13 comprend avantageusement un ou plusieurs principes actifs aptes à entrer en contact avec des eaux destinées à la consommation humaine, par exemple des agents bactéricides et/ou passivants (par exemple argent, cuivre, oxydes de cuivre, phosphate de zinc, oxyde de zinc). L'agent bactéricide est par exemple un sel de cuivre apte à restreindre l'activité des bactéries du sol 3. Les principes actifs bactéricides sont avantageusement à migration très lente (eau, sol) une fois l'émulsion coalescée. Les particules solides des agents bactéricides sont alors encapsulées par la résine : la diffusion de l'eau du milieu extérieur au travers de la résine conduit à l'ionisation de ces agents qui ultérieurement, par diffusion lente, seront relâchés dans le milieu extérieur.The second layer 13 advantageously comprises one or more active ingredients capable of coming into contact with water intended for human consumption, for example bactericidal and/or passivating agents (for example silver, copper, copper oxides, zinc phosphate, oxide zinc). The bactericidal agent is, for example, a copper salt capable of restricting the activity of soil bacteria 3. The bactericidal active principles are advantageously with very slow migration (water, soil) once the emulsion has coalesced. The solid particles of the bactericidal agents are then encapsulated by the resin: the diffusion of water from the external environment through the resin leads to the ionization of these agents which subsequently, by slow diffusion, will be released into the external environment.

On va maintenant décrire un procédé pour déposer le revêtement extérieur 9 sur l'élément de tuyauterie 7. Le procédé comprend une étape a) de dépôt sur l'élément de tuyauterie 7 de la première couche 11 telle que décrite ci-dessus, et une étape b) de dépôt sur la première couche 11 d'une seconde couche 13 telle que décrite ci-dessus.A method will now be described for depositing the outer coating 9 on the pipe element 7. The method comprises a step a) of depositing on the pipe element 7 the first layer 11 as described above, and a step b) of deposition on the first layer 11 of a second layer 13 as described above.

A l'étape a), la première couche 11 est avantageusement déposée par projection thermique, de préférence par arc électrique.In step a), the first layer 11 is advantageously deposited by thermal spraying, preferably by electric arc.

On dépose une quantité de matière suffisante pour obtenir une densité surfacique de la première couche 11 d'au moins 200 g/m<2>, de préférence d'au moins 350 g/m<2>. La projection se fait par exemple à partir de fils massifs ou de fils fourrés selon la disponibilité du zinc allié.A sufficient quantity of material is deposited to obtain a surface density of the first layer 11 of at least 200 g/m<2>, preferably of at least 350 g/m<2>. The projection is done for example from solid wires or cored wires depending on the availability of the zinc alloy.

A l'étape b), la seconde couche 13 est avantageusement déposée sur la première couche 11 alors que cette dernière n'est pas recouverte d'efflorescences blanches, c'est-à-dire avec un différé de temps réduit entre le dépôt de la seconde couche 13 et de la première couche 11.In step b), the second layer 13 is advantageously deposited on the first layer 11 while the latter is not covered with white efflorescences, that is to say with a reduced time difference between the deposition of the second layer 13 and the first layer 11.

A l'étape b), la seconde couche 13 est déposée avantageusement par pistolet sans air comprimé, en particulier pour les grandes surfaces, et/ou à la brosse, en particulier pour les petites surfaces ou les retouches, de telle manière que la seconde couche 13 ait une épaisseur avantageusement comprise entre 60 µm et 150 µm à sec, par exemple une épaisseur d'environ 120 µm à sec. La seconde couche 13 présente avantageusement une densité surfacique à sec comprise entre 120 g/m<2> et 350 g/m<2>, par exemple une densité surfacique à sec de 250 g/m<2>.In step b), the second layer 13 is advantageously deposited by gun without compressed air, in particular for large surfaces, and/or by brush, in particular for small surfaces or retouching, so that the second layer 13 has a thickness advantageously between 60 μm and 150 μm dry, for example a thickness of about 120 μm dry. The second layer 13 advantageously has a dry surface density of between 120 g/m<2> and 350 g/m<2>, for example a dry surface density of 250 g/m<2>.

Le dépôt de la seconde couche 13 est avantageusement au moins en partie réalisé par pistolet sans air comprimé, l'application réalisée au pistolet se faisant sur une surface ayant une température comprise entre 35°C et 60°C. Cette surface est portée à ladite température par exemple en immergeant au moins une partie de l'élément de tuyauterie 7 revêtu de la première couche 11 dans un bac d'eau à cette température.The deposition of the second layer 13 is advantageously at least partly carried out by spray gun without compressed air, the application carried out with the spray gun taking place on a surface having a temperature comprised between 35° C. and 60° C. This surface is brought to said temperature, for example by immersing at least part of the pipe element 7 coated with the first layer 11 in a tank of water at this temperature.

L'eau contient avantageusement un agent de conversion de surface, par exemple phosphate de zinc, oxyde de zinc, pour recouvrir la première couche 11 d'un film d'alliage superficiellement transformé. L'agent de conversion de surface adapté à du zinc allié dispose avantageusement des agréments réglementaires pour le contact avec les eaux destinées à la consommation humaine.The water advantageously contains a surface conversion agent, for example zinc phosphate, zinc oxide, to cover the first layer 11 with a superficially transformed alloy film. The surface conversion agent suitable for alloyed zinc advantageously has regulatory approvals for contact with water intended for human consumption.

Le mouillage de la première couche 11 par de l'eau contenant le principe actif conduit à recouvrir la surface de la première couche 11 d'un film d'alliage superficiellement transformé en, par exemple, hydroxyde et oxyde de zinc, ou phosphate de zinc, aptes à retarder l'oxydation ultérieure de la première couche 11 une fois l'élément de tuyauterie 1 soumis à son environnement de service, et favorables à une augmentation de la durée de la protection.The wetting of the first layer 11 by water containing the active ingredient results in covering the surface of the first layer 11 with an alloy film superficially transformed into, for example, zinc hydroxide and oxide, or zinc phosphate , capable of delaying the subsequent oxidation of the first layer 11 once the pipe element 1 has been subjected to its service environment, and favorable to an increase in the duration of the protection.

Exemple de revêtement non conforme à l'invention :Example of coating not in accordance with the invention:

Revêtement extérieur 9 sur tuyau 7 en fonte ductile, composé d'une première couche 11 métallisée déposée par arc électrique, de 400 g/m<2>d'alliage zinc-aluminium à 15% d'aluminium, et d'une seconde couche 13 constituée d'une peinture monocomposant en phase aqueuse, la seconde couche 13 ayant une épaisseur de 120 µm à sec et une densité surfacique à sec de 250 g/m<2>.External coating 9 on pipe 7 of ductile cast iron, composed of a first metallized layer 11 deposited by electric arc, of 400 g/m<2> of zinc-aluminum alloy with 15% aluminum, and of a second layer 13 consisting of a single-component paint in aqueous phase, the second layer 13 having a thickness of 120 µm dry and a surface density dry of 250 g/m<2>.

La peinture est une émulsion à base de copolymère acrylique-PVDC et a été appliquée après immersion du tuyau 7 revêtu de la première couche 11 dans un bac d'eau à 60 °C contenant un polyphosphate de zinc pour créer un film superficiel de quelques microns à la surface de la première couche 11.The paint is an emulsion based on acrylic-PVDC copolymer and was applied after immersing the pipe 7 coated with the first layer 11 in a tub of water at 60°C containing a zinc polyphosphate to create a surface film of a few microns. on the surface of the first layer 11.

L'émulsion de copolymère à base copolymère acrylique-PVDC comporte un principe actif, par exemple un sel de cuivre, en vue de restreindre l'activité des bactéries du sol 3 au niveau du revêtement extérieur 9.The copolymer emulsion based on acrylic-PVDC copolymer comprises an active ingredient, for example a copper salt, with a view to restricting the activity of soil bacteria 3 at the level of the outer coating 9.

Grâce aux caractéristiques de la première couche 11 et de la seconde couche 13 décrites ci-dessus, le revêtement extérieur 9 assure une protection anticorrosion encore plus efficace de l'élément de tuyauterie 7, en particulier en sol 3 corrosif, avec des propriétés sanitaires et environnementales améliorées. En effet, la seconde couche 13 bouche très efficacement les pores de la première couche 11. L'association de la seconde couche 13 sur la première couche 11 favorise l'amorce d'une conversion de la surface de gouttelettes métalliques constituant la première couche 11. En outre, le revêtement extérieur 9, de par sa constitution et son procédé d'application, est d'un coût très compétitif.Thanks to the characteristics of the first layer 11 and of the second layer 13 described above, the outer coating 9 provides even more effective anti-corrosion protection of the pipe element 7, in particular in corrosive soil 3, with sanitary and improved environments. Indeed, the second layer 13 very effectively blocks the pores of the first layer 11. The association of the second layer 13 on the first layer 11 promotes the initiation of a conversion of the surface of metal droplets constituting the first layer 11 In addition, the outer coating 9, by virtue of its constitution and its method of application, is very competitively priced.

La caractéristique optionnelle selon laquelle la surface de la première couche 11 est portée à la température comprise entre 35°C et60°C par immersion d'au moins une partie de l'élément de tuyauterie 7 revêtu de la première couche 11 dans de l'eau contenant de préférence un agent de conversion de surface, favorise l'apparition d'un film d'alliage superficiellement transformé.The optional characteristic according to which the surface of the first layer 11 is brought to a temperature of between 35° C. and 60° C. by immersing at least part of the pipe element 7 coated with the first layer 11 in water preferably containing a surface conversion agent, promotes the appearance of a superficially transformed alloy film.

En outre, la caractéristique optionnelle selon laquelle la seconde couche 13 est dépourvue de solvant ou de co-solvant organiques, notamment de solvant ou de co-solvant dérivés des hydrocarbures, présente l'avantage que le revêtement extérieur 9 est compatible avec les exigences règlementaires actuelles liées au contact avec les eaux destinées à la consommation humaine.In addition, the optional characteristic according to which the second layer 13 is devoid of organic solvent or co-solvent, in particular solvent or co-solvent derived from hydrocarbons, has the advantage that the outer coating 9 is compatible with regulatory requirements. related to contact with water intended for human consumption.

De plus l'absence de bisphénol dans la formulation des résines sélectionnées supprime le risque potentiel de toxicité pour l'homme associé à cette molécule.In addition, the absence of bisphenol in the formulation of the selected resins eliminates the potential risk of toxicity for humans associated with this molecule.

Ceci facilite les opérations de revêtement de l'élément de tuyauterie 7. Il est en effet possible de déposer le même revêtement 9 sur des zones destinées à être uniquement en contact avec le sol 3 corrosif et sur des zones, telles qu'une extrémité de tuyau ou une zone de découpe, pouvant se trouver au contact de l'eau 5 destinée à la consommation humaine.This facilitates the coating operations of the pipe element 7. It is in fact possible to deposit the same coating 9 on areas intended to be only in contact with the corrosive soil 3 and on areas, such as an end of pipe or a cutting zone, which may be in contact with water 5 intended for human consumption.

Par ailleurs, l'impact environnemental est fortement réduit par la suppression des émissions de solvants organiques volatils, ou « COV ». Les conditions de sécurité des opérateurs qui fabriquent ou posent l'élément de tuyauterie 1 sont améliorées. Le traitement et l'élimination des déchets liés à l'élément de tuyauterie 1 est réalisable par des installations conventionnelles de recyclage des peintures.In addition, the environmental impact is greatly reduced by eliminating emissions of volatile organic solvents, or “VOCs”. The safety conditions for operators who manufacture or install the pipe element 1 are improved. The treatment and elimination of the waste associated with the pipe element 1 can be carried out by conventional paint recycling installations.

Grâce à la caractéristique optionnelle selon laquelle la seconde couche 13 comprend un ou plusieurs principes actifs aptes à avoir une action bactéricide et/ou passivante, la résistance à long terme du revêtement 9 est améliorée dans tous les sols.Thanks to the optional characteristic according to which the second layer 13 comprises one or more active principles capable of having a bactericidal and/or passivating action, the long-term resistance of the coating 9 is improved in all soils.

Claims (13)

  1. An outer coating (9) for an underground piping element (7) made from iron, in particular cast iron, the outer coating (9) having a first porous layer (11) and a second porous layer (13) positioned on the first layer (11) and able to plug the pores of the first layer (11), the outer coating (9) being characterized in that:
    - the first layer (11) includes a zinc alloy or pseudo-alloy, the alloy or pseudo-alloy including, in terms of mass, at least 50% zinc, and preferably between 0.5% and 40% aluminum,
    - the first layer (11) includes magnesium at a mass concentration of between 0.5% and 3%, and/or copper at a mass concentration of between 0.5% and 3%, and/or silver at a mass concentration of between 0.5% and 3%, and
    - the second layer (13) comprises a one-component paint in the aqueous phase made from at least one synthetic resin emulsified, dispersed or dissolved in water.
  2. The outer coating (9) according to claim 1, characterized in that said at least one synthetic resin is formulated from at least one polymer or at least one copolymer chosen from the list consisting of acrylic, styrene acrylic, vinyl halide such as vinyl chloride, polyvinyl chloride acrylate, vinylidene halide such as vinylidene chloride, vinyl, methacrylate, polyvinyl acetate polymers or copolymers, and mixtures thereof.
  3. The outer coating (9) according to any one of claims 1 or 2, wherein the first layer (11) has a surface density of at least 200 g/m2, preferably at least 350 g/m2, for example approximately 350 g/m2.
  4. The outer coating (9) according to any one of claims 1 to 3, wherein the second layer (13) has no organic solvent or co-solvent, in particular solvent or co-solvent derived from hydrocarbons, and without bisphenol.
  5. The outer coating (9) according to any one of claims 1 to 4, wherein the second layer (13) includes one or more active ingredients able to come into contact with water intended for human consumption and have a bactericidal and/or passivating action.
  6. The outer coating (9) according to any one of claims 1 to 5, wherein the second layer (13) has a dry surface density comprised between 120 g/m2 and 350 g/m2.
  7. A coated piping element (1), made from iron, in particular cast iron, designed to be placed underground, including an outer coating (9) according to any one of the preceding claims.
  8. A method for depositing an outer coating (9) on a piping element (7) made from iron, in particular cast iron, designed to be placed underground, characterized in that it includes the following steps:
    a) deposition by metallization, preferably by electric arc, on the piping element (7) of a first porous layer (11) including a zinc alloy or pseudo-alloy, the alloy or pseudo-alloy including, in terms of mass, at least 50% zinc, and preferably between 0.5% and 40% aluminum, the first layer (11) including magnesium at a mass concentration of between 0.5% and 3%, and/or copper at a mass concentration of between 0.5% and 3%, and/or silver at a mass concentration of between 0.5% and 3%, and
    b) deposition on the first layer (11), not covered with white efflorescence, of a second porous layer (13) including a one-component paint in aqueous phase, made from at least one synthetic resin emulsified, dispersed or dissolved in the water.
  9. The method according to claim 8, wherein, in step b), said at least one synthetic resin is formulated from at least one polymer or at least one copolymer chosen from the list consisting of acrylic, styrene acrylic, vinyl halide such as vinyl chloride, polyvinyl chloride acrylate, vinylidene halide such as vinylidene chloride, vinyl, methacrylate, polyvinyl acetate polymers or copolymers, and mixtures thereof.
  10. The method according to claim 8 or 9, wherein step b) for depositing the second layer (13) is done by gun, and/or with a brush or roller, such that the second layer (13) has a dry thickness comprised between 60 µm and 150 µm.
  11. The method according to any one of claims 8 to 11, wherein step b) for depositing the second layer (13) is done such that the second layer (13) has a dry surface density comprised between 120 g/m2 and 350 g/m2.
  12. The method according to any one of claims 8 to 11, wherein step b) for depositing the second layer (13) is at least partially done by gun with no compressed air, the application by gun being done on a surface having a temperature comprised between 35°C and 60°C.
  13. The method according to claim 12, wherein, in step b), said surface is brought to the temperature comprised between 35°C and 60°C by immersing at least part of the piping element in water preferably containing a surface conversion agent to cover the first layer (11) with a superficially transformed alloy film, the conversion agent being suitable for contact with water intended for human consumption.
EP13734028.7A 2012-06-29 2013-06-28 Outer coating for an underground piping member made from iron, coated piping member and method for depositing the coating Active EP2867382B2 (en)

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FR1256268A FR2992708B1 (en) 2012-06-29 2012-06-29 EXTERIOR COATING FOR IRON-BASED BLEEDING ELEMENT, COATED PIPING MEMBER, AND COATING DEPOSITION METHOD
PCT/EP2013/063717 WO2014001544A1 (en) 2012-06-29 2013-06-28 Outer coating for an underground piping member made from iron, coated piping member and method for depositing the coating

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CA2877665C (en) 2020-07-14
FR2992708B1 (en) 2015-03-27
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ES2691422T3 (en) 2018-11-27
AU2013283229A1 (en) 2015-02-05
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US20150152994A1 (en) 2015-06-04
PL2867382T5 (en) 2023-01-09
PL2867382T3 (en) 2019-01-31
EP2867382A1 (en) 2015-05-06
TW201412898A (en) 2014-04-01
MX2014015872A (en) 2015-03-13
CA2877665A1 (en) 2014-01-03
AU2013283229B2 (en) 2017-05-25
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CN104411859A (en) 2015-03-11
BR112014032451B1 (en) 2020-10-13
ZA201409389B (en) 2015-11-25
WO2014001544A1 (en) 2014-01-03
EP2867382B1 (en) 2018-07-18
DK2867382T4 (en) 2022-09-05
KR20150027206A (en) 2015-03-11
KR102097090B1 (en) 2020-04-03
IN2014DN11060A (en) 2015-09-25
DK2867382T3 (en) 2018-10-29
JP2015530935A (en) 2015-10-29
FR2992708A1 (en) 2014-01-03
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BR112014032451A2 (en) 2017-06-27
RU2637045C2 (en) 2017-11-29

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